CLASS XX. 161 
B. Stems woody. 
Pinus. Staminate flowers—calyx 4-leaved, peltate; corolla 0; sta- 
mens many; anthers naked, 2, sessile, l-celled. Pistillate flowers— 
calyx in strobiles or cones, scales closely imbricate, 2-flowered : pistil 
1; nut with a membranous wing.—(pine.) 
CLASS xx. pia@cia. Staminate and pistillate flowers on dif- 
ferent plants. 
Order 2, Diandria. Two stamens. 
Sa’tix. Staminate flowers—ament cylindric; calyx a 1-flowered 
scale, with a nectariferous gland at the base; stamens 1to6. Pistillate 
flowers—ament and calyx like the staminate; stigmas 2, generally 2- 
cleft ; capsule I-celled; 2-valved; seeds many, with egret-like down. 
—‘willow.) , 
Order 5. Pentandria. Five stamens. 
Hum’utus. Staminate flowers—calyx 5-leaved; corolla 0; anthers 
with two pores at the extremity. Pistillate flowers—calyx 1-leaved ; 
entire, oblique, spreading; styles 2, seed 1, within the leaf-like calyx, 
infloresence strobile-form.—(hop.) 
Exotic. 
Can’nazis. Staminate flowers—calyx 5-parted. Pistillate flowers 
--calyx 5-leaved, entire, gaping laterally ; styles 2; nut 2-valved, with- 
in the closed calyx.—(hemp. ) 
Order 8. Octandria. Eight stamens. 
Po’putus. Staminate flowers—ament cylindric, calyx a torn scale; 
corolla turbinate, oblique, entire, supporting 8 to 30 stamens. Pistillate 
flowers—ament, calyx and corolla like the staminate; stigma 4 or 6- 
lobed: capsule 2-celled, 2-valved, many-seeded ; seed with egret-like 
hairs. Leaves have a tremulous motion.—(poplar, balm of Gilead.) 
Note. The 2lst Class, Cryptogamia being too difficult for the be- 
ginner in Botany to analyze, is omitted. 
